Double-action pump



July 19, 1932. M. A. CLARK DOUBLE ACTION PUMP Filed March 1, 1932 2Sheets-Sheet 1 INVENTOR 5 MA.CLL1-1 BY 9'3 ATTORNEY M. A. CLARK DOUBLEACTION PUMP July 19, 1932.

Filed March 1, 1932 2 Sheets-Shee MAQQZZ BY Qua? m ATTORNEY PatentedJuly 19, 1932 PATENT ()FFICE MARION A. CLARK, OF TULARE, CALIFORNIADOUBLE-ACTION PUMP Application filed March 1,

This invention relates to pumps of the plunger or piston type forsubmergence in the water in a well. My principal object is to provide adouble action pump of this character whose operation is controlledhydraulically from a mechanism disposed above the ground level, so thatthe pump may be suspended solely from the pipes leading to the surfaceand there is no underwater mechanism requiring lubrication and likely toget out of order. i

A further object is to provide a pump in which a single valve unit isall that is necessary to control the flow of water to and from theopposed double acting cylinders of the pump, and such valve is of a typewhich does not tend to stick or hang open or otherwise give trouble. Thepump may be used practically at any depthv depending on the power 26 ofthe surface control mechanism without any complication of operation andconstruction being necessary by reason of any increase in the depth ofposition of the pump. I

A further object of the invention is to produce a simple and inexpensivedevice and yet one which'will be exceedingly effective for the purposefor which it i designed.

These objects I accomplish by means of such structure and relativearrangement of parts as will fully appear by a perusal of the followingspecification and claims.

In the drawings similar characters of ref erence indicate correspondingparts in the several views:

Fig. 1 i a side view of the pump as in operation in a well showing thesurface control mechanism diagrammatically.

Fig. 2 is a sectional. elevation of the pump with the parts at thebeginning of 'a pumping stroke.

Fig. 3 is a similar view taken on the line 3-3 of Fig. 2 showing theparts after the start of said stroke.

w Fig. 4 is an enlarged sectional plan on the line i -40f Fig. 2.

Fig.- 5 is a cross ection of the upper cylinder head to show thedischarge passage therein.

Referring now more particularly to the characters of reference on thedrawings, the

1932. Serial No. 596,035.

numeral 1 denotes a centrally located valve and passage block, fromwhich upper and lower cylinders 2 and 3 of the same length pro ect,these cylinders being capped on their outer ends by heads 4and5respectively. The block is provided with a centrally disposed boreforming a valve chamber 6, open to both ends of the block. Tubes 7 aresecured to and project from ends of the chamber into the cylinders 2 and3 a certain distance and form a continuation of said chamber. Double-cuppistons 8 and 9 are slidable in the cylinders 2 and 3 respectively.These are attached to sleeves 10 which surround the tubes 7 in clearancerelation thereto and engage cup pistons 11 at the outer ends of thetubes so as to have a watertight fit therewith.

The adjacent ends of the sleeves are connected-by rods 12 slidablyprojecting through and guided in the block so that the pistons are tiedtogether. The piston unit is arranged so that when the upper piston 8 isat the bottom of its stroke in the cylinder 2, it is adjacent the upperend of the upper tube 7 andthe upper sleeve 10 is adjacent the top ofthe block. At the same time the lower piston. 9 is at the bottom of itsstroke and the upper end of. the corresponding sleeve 10 is close to thecup in the lower tube 7. When at the outer limit of their stroke thepiston cushioning cups 13 mounted in the pistons engage tapered socketsin the cylinder heads so as to absorb shocks. 7

A passage 14 leads from one sideofthe chamber6 intermediate its ends tothe top of the block outwardly of the cylinder 2 and is connected with aconduit 15 extending upwardly to the head 4, where it is connected withthe interior of the cylinder 2 by a passage 16 in said head. Similarlyanother passage 17 in the block leads from one side of the chamber 6some distance above the point of communication of the passage '14 to thebottom of the block 1 outwardly of the cylinder 3. Said passage 17 therecommunicates with a conduit 18 which leads to the lower head 5 andcommunicates with the interior of the cylinder 3 by a passage 19 in saidhead.

Communicating with the chamber 6 between the passages 14 and 17 is anoutward passage 20. This extends upwardly in the block to the top of thesame outwardly of the cylinder 2, and is connected to a conduit 21 whichextends upwardly to the head 4. The upper end of the conduit 21communicates with an upstanding discharge pipe 22 from which the pump issuspended by means of a passage 23 in the head.-

Intake ports 24 and 25 are cut through the walls of the chamber belowthe passage 14 and above the passage 17 respectively. These communicatewith the surrounding water in the well in which the pump is submerged byopenings 26 in the sides of the cylinders adjacent the block, and byopenings leading lengthwise in the block inside the cylinders to. saidports, as shown in Fig. 1.

Slidable in the chamber 6 is a piston valve comprising a central stem 27on which upper and lower pairs of spaced and oppositely disposed plungercups 28 and 29 are mounted. The valve is limited in its movement ineither direction by orificed stop discs 30 projecting across thechamber. The valve cups are so arranged relative to the differentpassages and ports which terminate in the chamber wall that when thevalve is in its lowest position the intake 24 is shut off from passage14 by the upper cup 29 and the passages 14 and 20 are in communicationwith each other between the adjacent cups of the upper and lower pairs.At the same time the intake 25 is in communication with the passage 17between the cups 28. When the valve is shifted to its upward limit ofmovement a similar butreverse matching-of the passages i obtained.

Communicating with the chamber 6 above and below the stops 30 are feedWater passages 31 both extending to the top of the block outwardly ofthe cylinder 2 and there connected to conduits 32 extending between theblock and the head 4. Here communication is established by passages 33in the head with the main water feed pipes 34- which extend to the topof the well. It may here be remarked that as far as the operation of thepump ls-COHGGIIlQd the various block passages could project to the sidesof the block for direct connection with vertical pipes. The arrangementshown however retains all the pipes within the diameter of the .block 1,so that the entire pump structure is very compact and it can be insertedin a well casing only sufliciently large to clear the block. Also thedischarge pipe 22 being centrally connected to the pump the latter issuspended without any tendency to tilt. The various parts are preferablyclamped together by studs 35 extending between the block and thecylinder heads.

At the top of the Well the feed pipes '34 are connected to the lowerends of cylinders 36 having plungers 36a therein which are reciprocatedin opposite directions by a suitpump as long as able driving mechanismindicated generally at 37. The capacity of each cylinder 36 is not lessthan the capacity of one of the tubes 7 and the corresponding sleeve 10when in their fully extended relation.

In operation the water passages of the operating mechanism, comprisingthe cylinders 36, the pipes 34, the sleeves 10 andll, tubes 7 andchamber 6 below lower cup 29 are completely filled with water which neednever be replenished except for any loss through leakage. The completelyfilled condition may be maintained from a tank 38 associated with andabove the cylinders and having checked communication therewith justbelow the uppermost position of the plungers. Assuming that theoperating mechanism is initially positioned so that the plunger of thecylinder 36 Whose pipe 34 is connected to the upper feed passage 31 isat the top of its stroke, of said plunger cause the water to force thevalve unit down against the lower stop 30. The upper pump plunger 8 isthen at the bottom of its stroke and all the parts are positioned asshown in Fig. 2.

A further pressure feeding of the water due to the continued depressionof the operating mechanism plunger causes such water to raise the piston8. The water in the cylinder above the piston then forces such water outthrough the passage 16, the conduit 15, the passage 14, the outletpassage 20, and up to the surface through the pipe 22 and communicatingpassages. A check valve 39 is interposed in the pipe 22 at any pointwithin a certain distance above the pump to prevent return of the waterto the cylinder. At the same time the piston 9 0f the lower cylinder ismoving away from its head causing water from the well to be drawn intosaid cylinder below the piston, through the port 25, passage 17, conduit18 and passage 19 in the head 5. The operating water previously in thetube 7 and sleeve 10 of the lower cylinder is forced back to thecorresponding operating cylinder 36, through the lower passage 31 andthecorresponding conduits.

By the time the operating plunger has left the bottom of its stroke thepiston '8 is at the top of its stroke. With a reversal of movement ofthe operating plungers the valve is reversed in position, which placesthe passage 20 port 24 and'the passage 14 in communication. The movementof the pump pistons and the flow ofwater into and out of the cylindersis thus reversed.

From the above it will be seen that nothing can interfere with theoperation of the the operating mechanism is working and such mechanismbeing fully accessible at all times it can be easily kept in order.There is nothing in the pump to the initial depression and 17 incommunication and the stick and give trouble or leak over a long periodof use and the only parts which will ever need replacing are the simpleand cheap leather cups.

Should the pump pistons become jammed for any reason however, possibledamage to the operating mechanism is prevented by bypasses 40 from thebottom of cylinders 36 to the tank, with adjustable safety or reliefvalves 40a in said conduits opening away from the cylinders.

From the foregoing description it will be readily seen that I haveproduced such a device as substantially fulfills the objects of theinvention as set forth herein.

While this specification sets forth in detail the present and preferredconstruction of the device, still in practice such deviations from suchdetail may be resorted to as do not form a departure from the spirit ofthe invention, as defined by the appended claims.

Having thus described my invention what I claim as new and useful anddesire to secure by Letters Patent is:

1. A double action pump comprising opposed cylinders, pistons slidabletherein, means connecting the pistons as a unit, a liquid actuatedreversible valve directly associated with the pump, a chamber in whichsaid valve is movable, means to pump a liquid into the chamber to movethe valve and alternately reverse the same, means whereby the liquidwill act to move one of the pistons after it has moved the valve in onedirection, an outlet from the chamber, and passage means between thevalve chamber and cylinders arranged relative to the valve and outlet sothat one piston will be forcing Water through the.

outlet as the other one is on its suction stroke, and vice versa withthe reversal of the valve.

2. A double action pump comprising opposed cylinders, pistons slidabletherein, means connecting the pistons as a unit, water intake and outletpassages to and from the cylinders, a reversible slide valve to controland allow the water to enter and be discharged from the cylindersalternately as the valve is reversed, a valve chamber means to pump aliquid into the valve chamber on opposite sides of the valve alternatelyto correspondingly move the valve in opposite directions, and means tocause such liquid, after it has moved the valve, to also move one of Ithe pistons through a stroke.

3. A structure as in claim 2, in which said .last named means comprisestubes mounted on and communicating with the valve chamber on oppositesides of the valve and extending axially ofthe pistons, and sleevessecured to the pistons and slidably engaging the tubes with a liquidlight fit.

4. A double action' pump comprising opposed cylinders, pistons slidabletherein,

means connecting the pistons as a unit, water intake'and outlet passagesto and from the cylinders, a reversible slide valve to control and allowthe water to enter and be discharged from the cylinders alternately asthe valve is reversed, a valve chamber, means remote from the pump andconnected to the valve chamber to force a liquid under pressure intosaid chamber on opposite sides of the valve alternately to move thevalve in opposite directions, and means whereby such liquid, after thevalve has been moved, will also move a corresponding piston through adischarge stroke.

5. A double action pump comprising a block having a central verticalbore forming a valve chamber, cylinders projecting vertically from aboveand below the block, heads on the outer ends of the cylinders, pistonsslidable in the cylinders, tubes secured to the block and formingextensions of the chamber, sleeves secured to the pistons and slidablyengaging the tubes, rods connecting the sleeves and extending throughthe block to tie the sleeves and pistons together as a unit, a slidevalve in the chamber arranged for limited movement therein, feed-liquidpassages connected to the chamber above and below the valve, means toalternately force liquid through said passages to alternately move thevalve in opposite directions and subsequently and alternately force thepistons through their discharge stroke, passages between the heads andthe chamher, an outlet from the chamber, a discharge pipe connected tosaid outlet, and intake passage means between said chamber and theexterior of the pump structure; said passages'and outlet being arrangedrelative to the valve so that as each piston is being moved on itsdischarge stroke, the corresponding head passage is in communicationWith the outlet while the corresponding 1ntake is closed off, and theintake to the other cylinder is in communication with the correspondinghead passage while the .outlet is shut off from the same.

6. A double action pump comprislng a block having a central verticalbore forming a valve chamber, cylinders projecting vertically from aboveand below the block, heads on the outer ends of the cylinders, pisto theblock and forming extensions of the chamber, sleeves secured to thepistons and slidably engaging the tube, rods connecting the sleeves andextending through the block to tie the sleeves and pistons together as aunit, a slide valve in the chamber arranged for limited movementtherein, feed-liquid passages connected to the chamber above and belowthe valve, means to alternately force liquid through said passages toalternately tons slidable in'the cylinders, tubes secured move the valvein opposite directions and subsequently and alternately force the pistons through their discharge stroke, passages between the heads and thechamber, an out let from the chamber, a discharge pipe connected to saidoutlet, said passages and outlet being arranged relative to the valve sothat the cylinder placed in communication with the outlet, and intakepassages to the cylinders communicating therewith only during thesuction stroke of the pistons.

7. A structure as in claim 6, in which the discharge pipe depends and isconnected to the upper cylinder head whereby the pump may be suspendedfrom said pipe; there bein passage means between the pipe and on letoutwardly of the uppercylinder.

8. A structure as in clalm 4, in which said liquid forcing meanscomprises a pair of cylinders, plungers therein, conduits from thecylinders to the valve chamber, and means to reciprocate the pistons inopposite directions simultaneously.

9. A structure as in claim 4, in which said liquid forcing meanscomprises a pair of cylinders, plungers therein, conduits from thecylinders to the valve chamber, means to reciprocate the pistons inopposite directions simultaneously, and means associated with thecylinders for relieving the liquid pressure therein if an excessiveresistance to the flow of the liquid through said conduits isencountered.

10. A structure as in claim 4, in which said liquid forcing meanscomprises a pair of cylinders, plungers therein, conduits from thecylinders to the valve chamber, means to reciprocate the pistons inopposite directions simultaneously, outlet passages from the bottom ofthe cylinders, and relief valves in said passages openingaway from thecylinders.

11. A structure as in claim 4, in which said liquid forcing meanscomprises a pair of cylinders, plungers therein, conduits from thecylinders to the valve chamber, means to reciprocate the pistons inopposite directions slmultaneously, a liquid supply reservoir, bypassesbetween said conduits and the.

reservoir, relief valves in said bypasses opening away from thecylinders, and intake passes from the reservoir to the cylinders justbelow the topmost position of the plungers.

In testimony whereof I aflix my signature.

MARION A. CLARK.

head passages are alternately

